* ext/bigdecimal/bigdecimal.c (BigDecimal_save_rounding_mode): fix typo.
  Fixes GH-343. Patch by @jgarber.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41663 b2dd03c8-39d4-4d8f-98ff-823fe69b080e